Plates 14, 15, 16, 17, 18, and 19. A 69 year old woman had cutancous horn growing from the interior portion of the scalp over a periode of 20 years. The 17 cm long cornu cutaneum was excised surgically. Chemical photographs were taken before and after the operation. The Photographic record was completed by a gross specimen photograph of the surgical specimen and a photomicrograph.